Watch live video of launch pad 41 at Cape Canaveral Air Force Station as an Atlas 5 rocket is prepared to launch the ESA’s Solar Orbiter mission. The Atlas 5 rocket will be rolled from it’s Vertical Inegration Building (VIF) to the pad on Saturday morning.

Weather forecasters expect a 70 percent chance of favorable conditions at Cape Canaveral for liftoff of a United Launch Alliance Delta 4 rocket Thursday with a GPS navigation satellite, marking the last flight of the Delta 4’s single-core variant after 29 flights since 2002.

United Launch Alliance called off the launch of a Delta 2 rocket from California’s Central Coast early Tuesday after boats ventured into a restricted safety exclusion zone and engineers ran out of time to resolve a technical problem on the launcher.